BD87A28FVM-TR

Overview

The BD87A28FVM-TR is a voltage detector with an integrated watchdog timer manufactured by ROHM Semiconductor. It features a typical under-voltage detection threshold of 2.8V with high precision of ±1.5% across the operating temperature range of -40°C to +105°C. The device operates within a reset active voltage range of 1.0V to 10V and consumes a typical circuit current of only 5µA. It utilizes an N-channel open-drain output capable of sourcing 0.7mA in the low state. External capacitors connected to CT and CTW terminals allow for adjustable reset delay and watchdog timer monitoring times, respectively.

Feature Summary

• High detection voltage accuracy of ±1.5% over the full industrial temperature range
• Ultra-low power consumption with a typical operating current of 5µA
• Integrated watchdog timer functionality for system reliability
• Adjustable reset delay and watchdog timer intervals via external capacitors

Applications

• Microprocessor reset circuits requiring precise voltage monitoring
• Embedded systems needing watchdog timer protection against software faults
• Battery-powered devices where ultra-low quiescent current is critical
• Industrial control units operating in extended temperature environments

Procurement Notes

Verify the specific suffix and packaging configuration when ordering, as availability may vary due to end-of-life status. Confirm that the MSOP-8 package dimensions match your PCB footprint requirements. Ensure that external capacitor values selected for CT and CTW pins comply with the datasheet specifications to achieve desired timing parameters. Check for any recent updates to the RoHS compliance status or manufacturing location before finalizing procurement.

Selection Notes

Select this component when a fixed 2.8V detection threshold meets system requirements. Consider the ±1.5% precision tolerance for applications demanding tight voltage margins. Evaluate the need for external timing capacitors if variable reset delays are necessary. Compare the 5µA current draw against other detectors if power efficiency is a primary design constraint. Ensure the N-ch open-drain output interface is compatible with the downstream logic levels.

Part Context

This part belongs to the BD87A series of voltage detectors from ROHM Semiconductor, which also includes variants like the BD87A34FVM with different detection thresholds. These components are designed for general-purpose monitoring in consumer and industrial electronics. The series emphasizes low power consumption and high accuracy within a compact MSOP-8 package, catering to space-constrained designs requiring reliable system reset and watchdog functions.

Replacement Considerations

Check for direct pin-compatible alternatives within the BD87A series with different detection voltages if the 2.8V threshold is unsuitable. Verify that any substitute maintains the same watchdog timer functionality and open-drain output configuration. Ensure replacement parts support the required -40°C to +105°C operating temperature range and similar current consumption profiles.